ABOUT THIS PRODUCT 13% Bamboo, 13% Cotton, 69% Nylon, 5% Spandex Extra Stretch in Opening Geometric Design Knee High | Padded Foot Boot Socks The Equine Couture Ladies Kelsey Padded Knee Hi Boot Socks are designed for riders, and are crafted with slim fabric that's still durable and stretchy to fit easily underneath tall boots. They also include padding at the foot for support that's ideal for long days at the barn or riding.